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PHP provides a default error handling, which is very simple. An error message is sent to the browser, with filename, line number and a message describing the error.

Error handling is a vital part while working with scripts and creating web applications.

Error checking and handling helps you handle the errors your way, ie you can do what you want to do in case an error occurs. It makes your code look more professional and also provides security.

This tutorial contains some of the most common error checking methods in PHP.

Some of the most common error checking methods of PHP are:

• Simple “die()” statements
• Custom errors and error triggers
• Error reporting

Using the die() function

The first example shows a simple script that opens a text file:

<?php
$file=fopen(”welcome.txt”,”r”);
?>

Error Output if the file does not exist:

Warning: fopen(welcome.txt) [function.fopen]: failed to open stream:No such file or directory in C:\webfolder\test.php on line 2

You can avoid this situation by simple methods. First look for the file if it exists, then open it and if not then you can use the die() function.

<?php
if(!file_exists(”welcome.txt”))
{
die(”File not found”);
}
else
{
$file=fopen(”welcome.txt”,”r”);
}
?>

Error Output if the file does not exist:

File not found

The code above is more efficient than the earlier code, because it uses a simple error handling mechanism to stop the script after the error.

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